I use these cards to play a game after telling the story Brown Bear, Brown Bear, What Do You See?. I give a card to each student and I explain the game. During the game, the teacher says: "I see a brown bear." (a yellow duck, a green frog, etc.) and the students having that card must stand up and act like that animal, making its voice.
The game is very funny and students really love it! They learn to recognise the animals and the colours. You can be tricky and try to say a colour with an animal that isn't on any card (e.g. "yellow chicken") or say an animal with a different colour (e.g.: "purple horse"). This way you can see how much they are paying attention or how much they know about their card.
You can also say a colour and an animal which don't belong together in these cards, such as "brown horse" (because the horse is blue) and all the students having that colour and that animal must stand up and act like the animals. In the example given, all the students having the brown bear and the blue horse must stand up! Other idea is that, since that animal doesn't appear in the story, the students must be quiet.
I included a card for "children", but you can leave it out, because the students are already children (they don't have to have a card to pretend to be children). If you say "I see children." all the students must stand up and move around, acting like children. This can be a bit noisy, depending on your class! Keep that in mind.
After you say all the animals, you can say to your students to exchange their cards with a classmate and start over, so that each student plays different animals.
These are just some ideas I've had to play with these cards. If you have any other ideas, please leave a comment! Thanks!